For dimensioning for the sizing of the inlet and outlet flanges of the main head there that take into account the number ¶V² defined in page 50 of the standard TEMA 9th edition and the same areas as recommended good practices defined in page number 252 then be applied vibration fel fluid flow defined on page 97 of the same number; also to verify the triaxial stresses flanges apply WRC107 bulletin. Greetings